Update README.md

Author: Pegah-Ardehkhani

README.md

@@ -26,10 +26,11 @@
 
 - 2.1. Bernoulli Distribution
 - 2.2. Binomial Distribution
-- 2.3. Geometric Distribution
-- 2.4. Poisson Distribution
-- 2.5. Discrete Uniform Distribution
-- 2.6. Hypergeometric Distribution
+- 2.3. Negative Binomial (Pascal) Distribution
+- 2.4. Geometric Distribution
+- 2.5. Poisson Distribution
+- 2.6. Discrete Uniform Distribution
+- 2.7. Hypergeometric Distribution
 
 **Chapter 3: Confidence Intervals** <a href="https://colab.research.google.com/github/Pegah-Ardehkhani/Statistics-and-Probability-in-Python/blob/main/Chapter%203%20Confidence%20Intervals.ipynb" target="_parent\"><img src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open In Colab"/></a> [![nbviewer](https://img.shields.io/badge/render-nbviewer-orange.svg)](https://nbviewer.org/github/Pegah-Ardehkhani/Statistics-and-Probability-in-Python/blob/main/Chapter%203%20Confidence%20Intervals.ipynb)